Pedrollo NGA-PRO Stainless Open-Impeller Pump

Pedrollo NGA-PRO pump explained

The Pedrollo NGA-PRO is an open-impeller centrifugal pump made in precision-cast AISI 316 stainless steel, rated up to 900 l/min (54 m³/h) and up to 20.5 m of head. It handles suspended solids up to 12 mm (NGA 1-2-PRO) or 20 mm (NGA 3-PRO). Seven Star LLC supplies the NGA-PRO in Oman and the GCC as an independent supplier in Muscat.

The numbers 1, 2 and 3 are size lines and the letters A to D are impeller trims. The datasheet lists NGA 1B-PRO at 0.55 kW (18 m), NGA 1A-PRO at 0.75 kW (20.5 m), NGA 2B-PRO at 0.55 kW (9.5 m), NGA 3D-PRO at 1.1 kW (12.5 m) and NGA 3A-PRO at 2.2 kW (19.5 m). NGAm is single-phase.

NGA-PRO technical specifications

The values above come from the manufacturer technical data for the series. Individual models inside the NGA-PRO range differ in power, head and current, so always confirm the exact model code before ordering.

How the NGA-PRO works and what limits it

The open impeller can pass impurity-laden liquid without clogging, and all wetted parts are AISI 316 (shaft AISI 316L). Working pressure is 6 bar for NGA 1-2-PRO and 10 bar for NGA 3-PRO, suction is up to 7 m, liquid -10 to +90 °C, ambient -10 to +40 °C and IP X4.

EN 733 defines the dimensions and rated duty points of end-suction centrifugal pumps on a bearing frame or close-coupled to a standard motor, with PN10 flanged ports. Because the port sizes, the shaft ends and the performance points are standardised, a pump of this kind can be matched to the dimensions of an existing installation and pumps from different makers share the same footprint logic. Liquid enters axially through the suction port, the impeller adds velocity, and the volute converts that velocity into pressure at the delivery flange. Efficiency is highest near the design point of the chosen impeller diameter.

NGA-PRO models and performance data

The heads in this table are read from the first point of the manufacturer 50 Hz performance table and fall as flow increases, so use the full curve for the real duty point. Where a 60 Hz version is needed, ask us: the manufacturer states that 60 Hz motors are available on request for many models.

Where the NGA-PRO fits: related Pedrollo pumps

The NGA already listed on this site is the cast iron version. For submersible solids handling see the TEX, BC and ZXm 2.

Selecting a NGA-PRO pump: checklist

• Select size 1, 2 or 3 from the flow
• Check the largest solid (12 mm or 20 mm)
• Check 6 bar or 10 bar limit
• Check suction lift and temperature
• Single-phase NGAm or three-phase NGA

Installing and maintaining the NGA-PRO

Install the pump on a rigid baseplate or concrete plinth with the motor and pump shafts aligned within the limits given in the manual, and use flexible joints or expansion pieces if pipe forces could load the flanges. Keep the suction line straight for several pipe diameters before the pump, with a reducer that does not trap air, and avoid a suction pipe smaller than the port. Fill and vent the casing before starting, check the rotation, and never run the pump against a closed valve for long. Inspect the mechanical seal after the first weeks of service and at regular intervals. Keep a record of the nameplate data, since impeller trim and motor size change with the letter at the end of the model name.

NGA-PRO applications in Oman and the GCC

Pedrollo suggests transfers from channels, rivers, tanks and basins. In Oman and the GCC the stainless body also suits washdown, irrigation channels and treated service water, though chlorides must still be verified. Not suited to long-fibre sewage.

On industrial and municipal sites in Oman, standardised pumps are chosen because they can replace or match existing units on the same baseplate and flange pattern. Dust, high ambient temperature and coastal humidity are the usual design conditions, so verify motor protection class and specify a seal suitable for the liquid. State if the liquid is treated water, brackish water or cooling-tower make-up.

Information to send with your NGA-PRO RFQ

• Duty point: flow rate and total head, plus the margin you want above it
• Liquid, temperature and any chlorides or other chemicals
• Suction conditions and NPSH available, pipe sizes and flange standard
• Motor requirement: voltage, frequency, IE class, and any bare-shaft or coupled arrangement
• Quantity, spares (mechanical seal, impeller) and delivery location

Documents and quotation

The manufacturer datasheet for the NGA-PRO is attached on this page, and the performance tables in it should be checked against your duty point. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.

Send the model code, quantity, voltage and frequency and the duty point, and we will confirm availability and prepare a quotation for Oman and the GCC.